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Proceedings Paper

Discussion and implementation of LDPC and PPM joint coding in laser underwater data transmission
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Paper Abstract

Aiming at the characteristics of signal fading caused by the intensity fluctuation and the off-axis drift of the underwater wireless optical communication, a method of laser-based trans-media transmission from atmosphere to underwater employing low density parity check (LDPC) and pulse position modulation (PPM) joint coding is proposed. The encoded frame structure is studied. Furthermore, by simulation, the performance of LDPC and PPM joint coding in Gaussian channel and weak turbulence channel is analyzed and compared with that of the uncoded PPM system. A practical communication system based on Field Programmable Gate Array (FPGA) is established and relevant lab tests are carried out. The simulation results show that the joint coding of LDPC and PPM can significantly improve the system error performance under these two channels, and the performance of Gaussian channel is better than that of weak turbulence channel. It is verified by the tank experiment that the system combining LDPC and PPM can obtain 1.5 dB code gain compared to the uncoded PPM system at the same bit error rate, which fully demonstrates the anti-interference ability of the system combining LDPC with PPM in data transmission.

Paper Details

Date Published: 18 December 2019
PDF: 6 pages
Proc. SPIE 11333, AOPC 2019: Advanced Laser Materials and Laser Technology, 113330G (18 December 2019); doi: 10.1117/12.2542189
Show Author Affiliations
Xiumei Li, Guilin Univ. of Electronic Technology (China)
Ning He, Guilin Univ. of Electronic Technology (China)
Hongyan Jiang, Guilin Univ. of Electronic Technology (China)


Published in SPIE Proceedings Vol. 11333:
AOPC 2019: Advanced Laser Materials and Laser Technology
Pu Zhou; Jian Zhang; Wenxue Li; Shibin Jiang; Takunori Taira, Editor(s)

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